feat: Apprise notification channel

[svenvg93]

📃 Description

This PR adds Apprise support with Filament v4, similar to #2380

closes #1961
closes #1620

Documentation

alexjustesen/speedtest-tracker-docs#94

Testing

To test Apprise you need to run local instance of Apprise or use the instance in the docker-compose.yml for development.

services:
  apprise:
    image: caronc/apprise:latest
    container_name: apprise
    restart: unless-stopped
    environment:
      APPRISE_STATEFUL_MODE: simple
      APPRISE_WORKER_COUNT: 1
    volumes:
      - apprise_data:/config
    network_mode: bridge
    ports:
      - "8000:8000"

volumes:
  apprise_data:
    name: apprise_data

3. Set the APPRISE_URL env with the URL to your instance
4. Set the Service URL in your Settings : according to apprise format (https://github.com/caronc/apprise/wiki#notification-services).

[alexjustesen]

Let's name this just apprise_server_url.

[svenvg93]

✅

[alexjustesen]

Let's drop the "sidecar" and use "server" instead where applicable.

[svenvg93]

✅

[alexjustesen]

apprise_server_url

[svenvg93]

✅